Menarcheal age among Japanese schoolgirls in 2011

Hinobayashi, Toshihiko; Shimizu, Mayuko; Onishi, Kyosuke; Kanazawa, Tadahiro; Akai, Seiki; Minami, Tōru

doi:10.4992/pacjpa.77.0_2pm-068

Cited by 4 publications

(4 citation statements)

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“…There is concern regarding the effect of prolonged amenorrhea on fertility and childbirth. The mean age at menarche in this study was 13.3 6 2.2 years, which is later than the mean age of 12.2 years, 19 and the proportion of primary amenorrhea was 3.9%. Di Cagno et al 20 have reported that heavy training before menarche delayed menarche by an average of 2 years in rhythmic gymnasts and that 50% of rhythmic gymnasts have amenorrhea.…”

Section: Discussioncontrasting

confidence: 52%

Menstrual Status and Pregnancy in Former Elite Long-Distance Runners With Menstrual Disorders

Fujita

Sasaki

Yoneda

et al. 2022

Clinical Journal of Sport Medicine

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Objective:To estimate the ratio of menstrual abnormalities, infertility, and other problems related to pregnancy and childbirth in former long-distance runners. We hypothesized that the female athlete triad during an athletic career affects future fertility and childbearing in former athletes.Design:Cross-sectional study.Setting:Participants of the All Japan University Women's Ekiden.Participants:Female former athletes who competed at national level were asked to complete the questionnaire; 137 valid responses were obtained.Independent Variables:Age at menarche and at the onset of pregnancy, history of amenorrhea and gynecological disorders, and lowest body mass index (BMI) during their athletic career.Main Outcome Measures:Menstrual status, history of pregnancy and childbirth, any related infertility treatment and problems, and history of stress fractures.Results:The mean age at menarche was 13.3 ± 2.2 (range, 10-25) years. Five athletes (3.6%) had primary amenorrhea. Eleven of the 137 participants (8.0%) required treatment for infertility. Sixty participants had 121 pregnancies, of which 5 were yet to deliver during the survey. Fifteen of 116 pregnancies (12.9%) ended in miscarriage, induced abortion, or stillbirth. Logistic regression analysis showed that the factors related to “infertility treatment” were age at the onset of pregnancy (P = 0.047) and higher BMI during their athletic career (P = 0.032; odds ratio, 2.19).Conclusions:The main factor influencing infertility was an older age at the time of pregnancy, similar to that observed in the general population. Amenorrhea or being underweight during their athletic career was not associated with problems related to conception and childbirth.

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Section: Discussioncontrasting

confidence: 52%

Menstrual Status and Pregnancy in Former Elite Long-Distance Runners With Menstrual Disorders

Fujita

Sasaki

Yoneda

et al. 2022

Clinical Journal of Sport Medicine

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“…Adolescence is an important stage of life in which children need to build a healthy personality and adopt their physical and mental changes. The timing of puberty onset is gradually becoming earlier in Japan [1,2], although the average heights and weights of seventh grade students have remained unchanged for a decade [3]. The developmental mechanisms of diseases associated with earlier puberty such as precocious puberty and abnormality of sex hormones have been explained, and treatment methods have been established.…”

Section: Implications and Contributionmentioning

confidence: 99%

The Relationship Between Quality of Life and Pubertal Timing in Adolescence: The Toyama Birth Cohort Study, Japan

Fujimura

Sekine

Yamada

2019

Journal of Adolescent Health

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“…MD among female competitors was 201 (34.0%), including 10 (1.7%) with delayed menarche who had not yet experienced menstruation. The average age of menarche in Japan is 12.2 years [22], and the definition of delayed menarche has been used since 2017 for those aged 15-17 years who have not yet experienced menarche [23]. The proportion of delayed menarche in the general population is unavailable.…”

Section: Participant Characteristicsmentioning

confidence: 99%

Prevalence and associated factors of stress fractures, menstrual dysfunction, and eating disorders in high school athletes

Yamamoto,

Watanabe,

Sakamaki-Sunaga

et al. 2024

Sports Psychiatry

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Objective: Stress fractures (SF), menstrual dysfunction (MD), and eating disorders (ED) in young athletes are important issues. We conducted this study to determine the frequency of SF, MD, and ED experienced by high school track and field athletes in Japan and to understand the factors associated with them. Materials and Methods: A cross-sectional study of 1199 high level high school track and field athletes (608 males and 591 females) who participated in a selective training camp held by the Japan Association of Athletics Federations. Results: Approximately one in four male and female athletes self-reported SF. Moreover, we identified the length of the practice time per week and the event (sprinting, middle-distance, jumping, and combined) as relevant factors. Approximately one in three female athletes self-reported MD history, with those participating in long-distance events experiencing it significantly more frequently than those participants in sprinting, throwing, and jumping events. Furthermore, we identified ED history and long-distance events as MD history-related factors. ED history was self-reported at low frequency without gender difference, and long-distance was significantly more frequently reported than sprinting and jumping. Conclusions: About a quarter of Japanese high school track and field athletes experience SF, and about a third of the females experience MD. The association of these with athletic events, training time, and ED should be considered.

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Menarcheal age among Japanese schoolgirls in 2011

Cited by 4 publications

References 0 publications

Menstrual Status and Pregnancy in Former Elite Long-Distance Runners With Menstrual Disorders

Menstrual Status and Pregnancy in Former Elite Long-Distance Runners With Menstrual Disorders

The Relationship Between Quality of Life and Pubertal Timing in Adolescence: The Toyama Birth Cohort Study, Japan

Prevalence and associated factors of stress fractures, menstrual dysfunction, and eating disorders in high school athletes

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